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Preparation method of polyethylene composition for bottle cap

A technology of polyethylene and composition, applied in the field of preparation of polyethylene composition, to achieve the effects of accelerated dissolution, wide application range, and favorable promotion and application

Inactive Publication Date: 2018-11-02
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual processing process, it is also necessary to comprehensively consider the influence of the pore size, pore distribution, pore structure, and desorption temperature of the odor adsorbent, which is often difficult to fully meet the needs.

Method used

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  • Preparation method of polyethylene composition for bottle cap
  • Preparation method of polyethylene composition for bottle cap
  • Preparation method of polyethylene composition for bottle cap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 50kg polyethylene powder (density 0.955g / cm 3 , melt flow rate 0.5g / 10min), 25g antioxidant 1010, 50g antioxidant 168, 25g halogen absorbent calcium stearate, 500 grams of medical stone (particle size 2500 mesh), after fully mixing by stirring, add A twin-screw extruder with a length-to-diameter ratio of L / D of 48:1, a feed rate of 50 g / min, and a screw speed of 100 rpm; supercritical carbon dioxide fluid is added to the extruder from the second heating zone of the twin-screw extruder. Out of the machine, the quality of the supercritical carbon dioxide fluid is 20% of the polyethylene quality, and the adding speed is 10g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-200°C. Vacuum devolatilize in the 8th area, extrude the granulated material strips to obtain the product through water-cooling and pelletizing.

Embodiment 2

[0044] Weigh 50kg polyethylene powder (density 0.956g / cm 3 , melt flow rate 1.5g / 10min), 50g antioxidant 1010, 100g antioxidant 168, 25g halogen absorbent calcium stearate, 1500 grams of medical stone (particle size 2500 mesh), 25 grams of fluoroelastomer, after After stirring and mixing fully, add the twin-screw extruder whose length-to-diameter ratio L / D is 48:1, the feeding speed is 50g / min, and the screw speed is 100 rpm; The second heating zone is added to the extruder, the quality of the supercritical carbon dioxide fluid is 10% of the polyethylene mass, and the feeding speed is 5g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-200°C. In the 8th heating zone, the product is vacuumized and devolatilized, extruded and granulated, and then water-cooled and granulated to obtain the product.

Embodiment 3

[0046] Weigh 50kg polyethylene powder (density 0.955g / cm 3 , melt flow rate 2.5g / 10min), 75g antioxidant 1076, 100g antioxidant 168, 50g halogen absorbent calcium stearate, 2500 grams of medical stone (particle size 2500 mesh), 50 grams of fluoroelastomer, after After stirring and mixing fully, add the twin-screw extruder whose length-to-diameter ratio L / D is 48:1, the feeding speed is 50g / min, and the screw speed is 100 rpm; The second heating zone is added to the extruder, the quality of the supercritical carbon dioxide fluid is 30% of the polyethylene mass, and the feeding speed is 15g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-210°C. In the 8th heating zone, the product is vacuumized and devolatilized, extruded and granulated, and then water-cooled and granulated to obtain the product.

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Abstract

The invention discloses a preparation method of a special material for a polyethylene bottle cap, and belongs to the technical field of materials. The polyethylene composition comprises at least 100 parts of polyethylene, 0.05-0.15 part of a primary antioxidant, 0.1-0.3 part of an auxiliary antioxidant, 0.05-0.2 part of a halogen absorbent, 0-5.0 parts of a deodorant and 0-0.01 part of a processing aid; supercritical carbon dioxide is used to assist extrusion, so that the thermal and oxygen degradation of the polyethylene during an extrusion process is effectively inhibited, and the dissolution of small molecule volatiles is greatly accelerated; the small molecule volatiles are removed by means of pressure relief and extraction before a bush die of an extruder. The preparation method provided by the invention has the advantages of simple process, wide application range and low production cost, and is favorable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a polyethylene composition used for bottle caps. Background technique [0002] Polyethylene (PE) is a polymer compound obtained by the polymerization of ethylene. Due to its rich raw materials and relatively simple synthesis process, compared with other general-purpose thermoplastics, PE has low price and outstanding stress resistance, cracking and wear resistance. It is the fastest growing variety among general-purpose thermoplastics. The status of construction and people's life is becoming more and more important, and it has become the fastest growing variety of plastics. It can be processed by blow molding, extrusion, injection molding and other methods, and is widely used in the manufacture of films, hollow products, fibers and daily sundries. However, polyethylene itself and various additives usually bring in a large odor and various vo...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L27/12C08K13/02C08K5/134C08K5/526C08K5/098C08K3/34C08K13/04C08K7/26B29B9/06B29B9/16
CPCB29B9/06B29B9/16B29B2009/168C08K3/34C08K5/098C08K5/1345C08K5/526C08K7/26C08K13/02C08K13/04C08L23/06C08L2201/08C08L2207/062C08L27/12Y02P20/54
Inventor 左胜武袁小亮王晶邱敦瑞徐振明傅勇
Owner SINOPEC YANGZI PETROCHEM
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